Batch replace color with another color

Question

Hi,
I would desperately need some assistance in trying to accomplish batch editing of ai-files via JavaScript.
What I would need to do, is go through a number (many!) of files, find items with certain swatch color (referenced by its name), and replace the item-fill with another swatch-color (also referenced by its name). Then save the document with another name.
Other parts I have managed to do, except find/compare/modify the fill color of an item.
I have gone through these forums and tried a number of things to a point where I am currently very confused and frustrated 
Some details (if it helps any), I'm using Illustrator CS3 and JavaScript.
Here's the closest where I got with trying to find a certain color and eventually changing it:
#target illustrator
var sourceFile, findColor, replaceColor;
sourceFile = new File().openDlg('Please select your Illustrator file…');
open(sourceFile);
var docRef = app.activeDocument;
findColor = docRef.swatches.getByName("vih");
// replaceColor not yet used anywhere
replaceColor = docRef.swatches.getByName("sin");
for(var obj = docRef.pageItems.length - 1; obj >= 0; obj--) {
    if(docRef.pageItems[obj].fillColor == findColor) {
        alert("Match found"); //It never seems to get here, so my comparison clearly is not working?
    else {
        alert ("No specified color found!");
docRef.close();
(and yes, I'm completely new with java-scripting, so even this is constructed from bits of sample-scripts and other scripts found from these forums)
Please, I would really appreciate any help, this can't really be such a difficult task to do... can it?
BR,
Johanna

Answer 1

I only tried a very basic test in my case ALL path items were filled with various CMYK swatches and the swap did take place so the comparison did work. I would suspect that you have a path item that contains NO fill so any of its properties would be undefined. You can also include this in your code too. This should work for both filled and stroked path items in CMYK art.
#target illustrator
var docRef = app.activeDocument;
with (docRef) {
var findColor = swatches.getByName('vih').color;
var replaceColor = swatches.getByName('sin').color;
for (var i = 0; i < pathItems.length; i++) {
if (pathItems[i].filled == true) {
with (pathItems[i].fillColor) {
if (cyan == findColor.cyan && magenta == findColor.magenta && yellow == findColor.yellow && black == findColor.black) {
$.writeln('True');
cyan = replaceColor.cyan, magenta = replaceColor.magenta, yellow = replaceColor.yellow, black = replaceColor.black;
} else {
$.writeln('False');
if (pathItems[i].stroked == true) {
with (pathItems[i].strokeColor) {
if (cyan == findColor.cyan && magenta == findColor.magenta && yellow == findColor.yellow && black == findColor.black) {
$.writeln('True');
cyan = replaceColor.cyan, magenta = replaceColor.magenta, yellow = replaceColor.yellow, black = replaceColor.black;
} else {
$.writeln('False');
//saveAs(filePath, saveOptions)